Phonograph or graphophone reproducer.



a No. 676,270. Patented lune ll, I901.

l. W. NORCROSS, In. PHONOGRAPH 0R GRAPHOPHONE REPRUDUCER.

(Application filed Nov. 26, 1900,) v (No Model.)

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UNITED STATES PATENT OFFICE.

ISAAO W. NORORO SS IR, OF NEW YORK, N. Y., ASSIGNOR. TO THE HAW- THORNE ANDv SHEBLE MANUFACTURING COMPANY, OF PHILADELPHIA,

PENNSYLVANIA PHONOGRAPl-l OR GRAPHOPHONE REPRODUCER.

SPECIFICATION forming part of Letters Patent No. 676,270, dated June 1 1, 1901.

Application filed November 26, 1900. Serial No. 37,787. (No model.)

T all whom it may concern:

Be it known that I, ISAAC NV. 'NORCROSS,

' Jr., acitizcn of the United States, and a resi phone instrument with an attachment where-.

by the reproductions are improvedboth in volume and distinctness of tone.

The accompanying drawing shows a longitudinal section, on an exaggeratedscale, of a r 5 graphophone-reproducer made in accordance with my invention.

So far as the general construction of the reproducer is concerned it may be similar to those now in use, my invention consisting of an attachment to the diaphragm 1 of the reproducer whereby the vibrations of said diaphragm under the action of the record are so affected as to materially improve the result. This attachment consists of a hollow boss 2,

applied to the lower face of the diaphragm 1 and carrying a reproducer-point 3 similar to that which is ordinarily attached directly to the reproducer-diaphragm. The hollow boss 2 may be of cup-like or inverted-conical form 0 and may be composed of any material found to be available for the purpose, aluminium being preferred. Owing to the extended area of contact of the hollow boss 2 with the diaphragm 1 the vibrations of the latter are so much improved as compared with those of a diaphragm having the reproducer-point applied directly to the same that better reproductions are obtained both as regards volume and distinctness of tone, the curved form of the boss 2 rendering it so stiif that there is no springing of the same, the undulations of the record being transmitted to the diaphragm without any loss in extent of vibration of the diaphragm due to the interposed transmitter.

,I am aware that it has been proposed to provide a sound-recorder with a conical diaphragm having around the enlarged end of the cone a projecting flange, whereby said cone is secured to the holder; but my invention is distinct from this in having the ordi- 5o nary flat diaphragm, the purpose of my in- .vention being to transmit to such fiat diaphragm more effectively than usual the vi brations due to the passage of the undulat= ing record beneath the reproducer-point.

The hollow boss will be located on the diaphragm in such position as will give the best result. As shown in the drawing, it is located somewhat off center longitudinally, this position having been found in practice to be a good one.

Having thus described my invention, I claim and desire to secure by Letters Patent A phonograph or graphophone reproducer having a flat diaphragm with a hollow boss attached to its outer face and carrying the reproducer-point, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ISAAC W. nononossm 1,. 5.

Witnesses:

JAs. J. DALY, FRANK WEBBER. 

